Few-Hundred GHz Carbon Nanotube Nanoelectromechanical Systems (NEMS)

Dynamics-enabled Nanoelectromechanical Systems (nems) Oscillators

Capacitive spring softening in single-walled carbon nanotube nanoelectromechanical resonators.

We report the capacitive spring softening effect observed in single-walled carbon nanotube (SWNT) nanoelectromechanical (NEM) resonators. The nanotube resonators adopt a dual-gate configuration with both bottom-gate and end-gate capable of tuning the resonance frequency through capacitive coupling. Interestingly, downward resonance frequency shifting is observed with increasing end-gate voltage...

Parametric amplification in single-walled carbon nanotube nanoelectromechanical resonators

The low quality factor (Q) of single-walled carbon nanotube (SWNT) resonators has limited their sensitivity in sensing application. To this end, we employ the technique of parametric amplification by modulating the spring constant of SWNT resonators at twice the resonant frequency and achieve 10 times Q enhancement. The highest Q obtained at room temperature is around 700, which is 3–4 times be...

Single carbon nanotube transistor at GHz frequency.

We report on microwave operation of top-gated single carbon nanotube transistors. From transmission measurements in the 0.1-1.6 GHz range, we deduce device transconductance gm and gate-nanotube capacitance Cg of micro- and nanometric devices. A large and frequency-independent gm approximately 20 microS is observed on short devices, which meets the best dc results. The capacitance per unit gate ...

Study of Carbon NanoTube Field Effect Transistors for NEMS

The recent developments of Carbon NanoTube Field Effect Transistor (CNTFET) technology indicate the perspective of the Nanoelectromechanical systems (NEMS). Carbon nanotubes (CNT) are ideal candidates for NEMS due to their chemical and physical structures, low masses and exceptional stiffness. Study of NEMS devices in the light of quantum mechanics requires understanding the interplay between t...